only compile invalid plugins

src/rebar_plugins.erl

@@ -18,11 +18,12 @@ install(State) ->
     {ok, State2} = rebar_prv_install_deps:handle_deps(State1, Plugins),
 
     Apps = rebar_state:get(State2, all_deps),
+    ToBuild = lists:dropwhile(fun rebar_app_info:valid/1, Apps),
     lists:foreach(fun(AppInfo) ->
                           C = rebar_config:consult(rebar_app_info:dir(AppInfo)),
                           S = rebar_state:new(rebar_state:new(), C, rebar_app_info:dir(AppInfo)),
                           rebar_prv_compile:build(S, AppInfo)
-                  end, Apps),
+                  end, ToBuild),
 
     PluginProviders = plugin_providers(Plugins),
     {ok, PluginProviders, rebar_state:set(State2, deps_dir, ?DEFAULT_DEPS_DIR)}.

src/rebar_prv_install_deps.erl

@@ -124,7 +124,6 @@ handle_deps(State, Deps) ->
 
     %% Sort all apps to build order
     State3 = rebar_state:set(State2, all_deps, AllDeps),
-
     {ok, State3}.